The Gas Valve Cooktop is an OEM part for Bosch cooktops. This valve is responsible for controlling the flow of gas to the burners on the cooktop. It opens and closes to allow gas to pass through when a burner is turned on and stops the flow of gas when the burner is turned off.  Causes of a bad gas valve can include wear and tear over time, issues with the valve mechanism such as stuck or blocked components, or damage from exposure to moisture or impact.  Symptoms of a bad gas valve include: Burners not lighting or sparking repeatedly without igniting  Uneven or unpredictable burner flame heights Burners not getting hot enough for cooking Burners that cannot be turned on or off Gas leaks around the valve area This OEM Bosch part is also compatible with Thermador, Gaggenau, and some Kenmore cooktop models.00411253 (AP2828839) replaces 00411251, 00411252, 00486650, 1013831, 15-10-188, 20-01-874, 20-02-500, 411251, 411252, 411253, 486650, AH3456743, EA3456743, PS3456743, PS8707103.